81 x 9 = 801. What must you do to make the this equation true?

A lion and its tamer are standing inside a cage that measures 1 unit in radius. Both of them can effortlessly run at the speed of 1 unit maximum.

1) Suppose the lion is hungry, will he be able to eat up the tamer?
2) If yes, how long can the tamer survive?

Find the missing letter in the last circle logically in the given below picture.

If it took eight men ten hours to build a wall, how long would it take four men to build it?

John is looking at Jenifer, but Jenifer is looking at Jacob. John is married, but Jacob is not.

Is a married person looking at an unmarried person ?

What do you see in the image below

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?